The games we play in zapsmall might apply to your current question.
zapsmall rounds to a specified number of digits.
The initial intent of zapsmall was to display 10^(-16) as 0.
Rich
> tmp <- c(1, 1 + c(-1,1)*10^(-14))
> tmp
[1] 1 1 1
> unique(tmp)
[1] 1 1 1
> unique(zapsmall(tmp))
[1] 1
>
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